﻿/**
 * Isotope v1.5.19
 * An exquisite jQuery plugin for magical layouts
 * http://isotope.metafizzy.co
 *
 * Commercial use requires one-time license fee
 * http://metafizzy.co/#licenses
 *
 * Copyright 2012 David DeSandro / Metafizzy
 */

/*jshint asi: true, browser: true, curly: true, eqeqeq: true, forin: false, immed: false, newcap: true, noempty: true, strict: true, undef: true */
/*global jQuery: false */

(function (window, $, undefined) {

    'use strict';

    // get global vars
    var document = window.document;
    var Modernizr = window.Modernizr;

    // helper function
    var capitalize = function (str) {
        return str.charAt(0).toUpperCase() + str.slice(1);
    };

    // ========================= getStyleProperty by kangax ===============================
    // http://perfectionkills.com/feature-testing-css-properties/

    var prefixes = 'Moz Webkit O Ms'.split(' ');

    var getStyleProperty = function (propName) {
        var style = document.documentElement.style,
        prefixed;

        // test standard property first
        if (typeof style[propName] === 'string') {
            return propName;
        }

        // capitalize
        propName = capitalize(propName);

        // test vendor specific properties
        for (var i = 0, len = prefixes.length; i < len; i++) {
            prefixed = prefixes[i] + propName;
            if (typeof style[prefixed] === 'string') {
                return prefixed;
            }
        }
    };

    var transformProp = getStyleProperty('transform'),
      transitionProp = getStyleProperty('transitionProperty');


    // ========================= miniModernizr ===============================
    // <3<3<3 and thanks to Faruk and Paul for doing the heavy lifting

    /*!
   * Modernizr v1.6ish: miniModernizr for Isotope
   * http://www.modernizr.com
   *
   * Developed by:
   * - Faruk Ates  http://farukat.es/
   * - Paul Irish  http://paulirish.com/
   *
   * Copyright (c) 2009-2010
   * Dual-licensed under the BSD or MIT licenses.
   * http://www.modernizr.com/license/
   */

    /*
   * This version whittles down the script just to check support for
   * CSS transitions, transforms, and 3D transforms.
  */

    var tests = {
        csstransforms: function () {
            return !!transformProp;
        },

        csstransforms3d: function () {
            var test = !!getStyleProperty('perspective');
            // double check for Chrome's false positive
            if (test) {
                var vendorCSSPrefixes = ' -o- -moz- -ms- -webkit- -khtml- '.split(' '),
            mediaQuery = '@media (' + vendorCSSPrefixes.join('transform-3d),(') + 'modernizr)',
            $style = $('<style>' + mediaQuery + '{#modernizr{height:3px}}' + '</style>')
                        .appendTo('head'),
            $div = $('<div id="modernizr" />').appendTo('html');

                test = $div.height() === 3;

                $div.remove();
                $style.remove();
            }
            return test;
        },

        csstransitions: function () {
            return !!transitionProp;
        }
    };

    var testName;

    if (Modernizr) {
        // if there's a previous Modernzir, check if there are necessary tests
        for (testName in tests) {
            if (!Modernizr.hasOwnProperty(testName)) {
                // if test hasn't been run, use addTest to run it
                Modernizr.addTest(testName, tests[testName]);
            }
        }
    } else {
        // or create new mini Modernizr that just has the 3 tests
        Modernizr = window.Modernizr = {
            _version: '1.6ish: miniModernizr for Isotope'
        };

        var classes = ' ';
        var result;

        // Run through tests
        for (testName in tests) {
            result = tests[testName]();
            Modernizr[testName] = result;
            classes += ' ' + (result ? '' : 'no-') + testName;
        }

        // Add the new classes to the <html> element.
        $('html').addClass(classes);
    }


    // ========================= isoTransform ===============================

    /**
   *  provides hooks for .css({ scale: value, translate: [x, y] })
   *  Progressively enhanced CSS transforms
   *  Uses hardware accelerated 3D transforms for Safari
   *  or falls back to 2D transforms.
   */

    if (Modernizr.csstransforms) {

        // i.e. transformFnNotations.scale(0.5) >> 'scale3d( 0.5, 0.5, 1)'
        var transformFnNotations = Modernizr.csstransforms3d ?
      { // 3D transform functions
          translate: function (position) {
              return 'translate3d(' + position[0] + 'px, ' + position[1] + 'px, 0) ';
          },
          scale: function (scale) {
              return 'scale3d(' + scale + ', ' + scale + ', 1) ';
          }
      } :
      { // 2D transform functions
          translate: function (position) {
              return 'translate(' + position[0] + 'px, ' + position[1] + 'px) ';
          },
          scale: function (scale) {
              return 'scale(' + scale + ') ';
          }
      }
    ;

        var setIsoTransform = function (elem, name, value) {
            // unpack current transform data
            var data = $.data(elem, 'isoTransform') || {},
          newData = {},
          fnName,
          transformObj = {},
          transformValue;

            // i.e. newData.scale = 0.5
            newData[name] = value;
            // extend new value over current data
            $.extend(data, newData);

            for (fnName in data) {
                transformValue = data[fnName];
                transformObj[fnName] = transformFnNotations[fnName](transformValue);
            }

            // get proper order
            // ideally, we could loop through this give an array, but since we only have
            // a couple transforms we're keeping track of, we'll do it like so
            var translateFn = transformObj.translate || '',
          scaleFn = transformObj.scale || '',
          // sorting so translate always comes first
          valueFns = translateFn + scaleFn;

            // set data back in elem
            $.data(elem, 'isoTransform', data);

            // set name to vendor specific property
            elem.style[transformProp] = valueFns;
        };

        // ==================== scale ===================

        $.cssNumber.scale = true;

        $.cssHooks.scale = {
            set: function (elem, value) {
                // uncomment this bit if you want to properly parse strings
                // if ( typeof value === 'string' ) {
                //   value = parseFloat( value );
                // }
                setIsoTransform(elem, 'scale', value);
            },
            get: function (elem, computed) {
                var transform = $.data(elem, 'isoTransform');
                return transform && transform.scale ? transform.scale : 1;
            }
        };

        $.fx.step.scale = function (fx) {
            $.cssHooks.scale.set(fx.elem, fx.now + fx.unit);
        };


        // ==================== translate ===================

        $.cssNumber.translate = true;

        $.cssHooks.translate = {
            set: function (elem, value) {

                // uncomment this bit if you want to properly parse strings
                // if ( typeof value === 'string' ) {
                //   value = value.split(' ');
                // }
                //
                // var i, val;
                // for ( i = 0; i < 2; i++ ) {
                //   val = value[i];
                //   if ( typeof val === 'string' ) {
                //     val = parseInt( val );
                //   }
                // }

                setIsoTransform(elem, 'translate', value);
            },

            get: function (elem, computed) {
                var transform = $.data(elem, 'isoTransform');
                return transform && transform.translate ? transform.translate : [0, 0];
            }
        };

    }

    // ========================= get transition-end event ===============================
    var transitionEndEvent, transitionDurProp;

    if (Modernizr.csstransitions) {
        transitionEndEvent = {
            WebkitTransitionProperty: 'webkitTransitionEnd',  // webkit
            MozTransitionProperty: 'transitionend',
            OTransitionProperty: 'oTransitionEnd',
            transitionProperty: 'transitionEnd'
        }[transitionProp];

        transitionDurProp = getStyleProperty('transitionDuration');
    }

    // ========================= smartresize ===============================

    /*
   * smartresize: debounced resize event for jQuery
   *
   * latest version and complete README available on Github:
   * https://github.com/louisremi/jquery.smartresize.js
   *
   * Copyright 2011 @louis_remi
   * Licensed under the MIT license.
   */

    var $event = $.event,
      resizeTimeout;

    $event.special.smartresize = {
        setup: function () {
            $(this).bind("resize", $event.special.smartresize.handler);
        },
        teardown: function () {
            $(this).unbind("resize", $event.special.smartresize.handler);
        },
        handler: function (event, execAsap) {
            // Save the context
            var context = this,
          args = arguments;

            // set correct event type
            event.type = "smartresize";

            if (resizeTimeout) { clearTimeout(resizeTimeout); }
            resizeTimeout = setTimeout(function () {
                jQuery.event.handle.apply(context, args);
            }, execAsap === "execAsap" ? 0 : 100);
        }
    };

    $.fn.smartresize = function (fn) {
        return fn ? this.bind("smartresize", fn) : this.trigger("smartresize", ["execAsap"]);
    };



    // ========================= Isotope ===============================


    // our "Widget" object constructor
    $.Isotope = function (options, element, callback) {
        this.element = $(element);

        this._create(options);
        this._init(callback);
    };

    // styles of container element we want to keep track of
    var isoContainerStyles = ['width', 'height'];

    var $window = $(window);

    $.Isotope.settings = {
        resizable: true,
        layoutMode: 'masonry',
        containerClass: 'isotope',
        itemClass: 'isotope-item',
        hiddenClass: 'isotope-hidden',
        hiddenStyle: { opacity: 0, scale: 0.001 },
        visibleStyle: { opacity: 1, scale: 1 },
        containerStyle: {
            position: 'relative',
            overflow: 'hidden'
        },
        animationEngine: 'best-available',
        animationOptions: {
            queue: false,
            duration: 800
        },
        sortBy: 'original-order',
        sortAscending: true,
        resizesContainer: true,
        transformsEnabled: !$.browser.opera, // disable transforms in Opera
        itemPositionDataEnabled: false
    };

    $.Isotope.prototype = {

        // sets up widget
        _create: function (options) {

            this.options = $.extend({}, $.Isotope.settings, options);

            this.styleQueue = [];
            this.elemCount = 0;

            // get original styles in case we re-apply them in .destroy()
            var elemStyle = this.element[0].style;
            this.originalStyle = {};
            // keep track of container styles
            var containerStyles = isoContainerStyles.slice(0);
            for (var prop in this.options.containerStyle) {
                containerStyles.push(prop);
            }
            for (var i = 0, len = containerStyles.length; i < len; i++) {
                prop = containerStyles[i];
                this.originalStyle[prop] = elemStyle[prop] || '';
            }
            // apply container style from options
            this.element.css(this.options.containerStyle);

            this._updateAnimationEngine();
            this._updateUsingTransforms();

            // sorting
            var originalOrderSorter = {
                'original-order': function ($elem, instance) {
                    instance.elemCount++;
                    return instance.elemCount;
                },
                random: function () {
                    return Math.random();
                }
            };

            this.options.getSortData = $.extend(this.options.getSortData, originalOrderSorter);

            // need to get atoms
            this.reloadItems();

            // get top left position of where the bricks should be
            this.offset = {
                left: parseInt((this.element.css('padding-left') || 0), 10),
                top: parseInt((this.element.css('padding-top') || 0), 10)
            };

            // add isotope class first time around
            var instance = this;
            setTimeout(function () {
                instance.element.addClass(instance.options.containerClass);
            }, 0);

            // bind resize method
            if (this.options.resizable) {
                $window.bind('smartresize.isotope', function () {
                    instance.resize();
                });
            }

            // dismiss all click events from hidden events
            this.element.delegate('.' + this.options.hiddenClass, 'click', function () {
                return false;
            });

        },

        _getAtoms: function ($elems) {
            var selector = this.options.itemSelector,
          // filter & find
          $atoms = selector ? $elems.filter(selector).add($elems.find(selector)) : $elems,
          // base style for atoms
          atomStyle = { position: 'absolute' };

            if (this.usingTransforms) {
                atomStyle.left = 0;
                atomStyle.top = 0;
            }

            $atoms.css(atomStyle).addClass(this.options.itemClass);

            this.updateSortData($atoms, true);

            return $atoms;
        },

        // _init fires when your instance is first created
        // (from the constructor above), and when you
        // attempt to initialize the widget again (by the bridge)
        // after it has already been initialized.
        _init: function (callback) {

            this.$filteredAtoms = this._filter(this.$allAtoms);
            this._sort();
            this.reLayout(callback);

        },

        option: function (opts) {
            // change options AFTER initialization:
            // signature: $('#foo').bar({ cool:false });
            if ($.isPlainObject(opts)) {
                this.options = $.extend(true, this.options, opts);

                // trigger _updateOptionName if it exists
                var updateOptionFn;
                for (var optionName in opts) {
                    updateOptionFn = '_update' + capitalize(optionName);
                    if (this[updateOptionFn]) {
                        this[updateOptionFn]();
                    }
                }
            }
        },

        // ====================== updaters ====================== //
        // kind of like setters

        _updateAnimationEngine: function () {
            var animationEngine = this.options.animationEngine.toLowerCase().replace(/[ _\-]/g, '');
            var isUsingJQueryAnimation;
            // set applyStyleFnName
            switch (animationEngine) {
                case 'css':
                case 'none':
                    isUsingJQueryAnimation = false;
                    break;
                case 'jquery':
                    isUsingJQueryAnimation = true;
                    break;
                default: // best available
                    isUsingJQueryAnimation = !Modernizr.csstransitions;
            }
            this.isUsingJQueryAnimation = isUsingJQueryAnimation;
            this._updateUsingTransforms();
        },

        _updateTransformsEnabled: function () {
            this._updateUsingTransforms();
        },

        _updateUsingTransforms: function () {
            var usingTransforms = this.usingTransforms = this.options.transformsEnabled &&
        Modernizr.csstransforms && Modernizr.csstransitions && !this.isUsingJQueryAnimation;

            // prevent scales when transforms are disabled
            if (!usingTransforms) {
                delete this.options.hiddenStyle.scale;
                delete this.options.visibleStyle.scale;
            }

            this.getPositionStyles = usingTransforms ? this._translate : this._positionAbs;
        },


        // ====================== Filtering ======================

        _filter: function ($atoms) {
            var filter = this.options.filter === '' ? '*' : this.options.filter;

            if (!filter) {
                return $atoms;
            }

            var hiddenClass = this.options.hiddenClass,
          hiddenSelector = '.' + hiddenClass,
          $hiddenAtoms = $atoms.filter(hiddenSelector),
          $atomsToShow = $hiddenAtoms;

            if (filter !== '*') {
                $atomsToShow = $hiddenAtoms.filter(filter);
                var $atomsToHide = $atoms.not(hiddenSelector).not(filter).addClass(hiddenClass);
                this.styleQueue.push({ $el: $atomsToHide, style: this.options.hiddenStyle });
            }

            this.styleQueue.push({ $el: $atomsToShow, style: this.options.visibleStyle });
            $atomsToShow.removeClass(hiddenClass);

            return $atoms.filter(filter);
        },

        // ====================== Sorting ======================

        updateSortData: function ($atoms, isIncrementingElemCount) {
            var instance = this,
          getSortData = this.options.getSortData,
          $this, sortData;
            $atoms.each(function () {
                $this = $(this);
                sortData = {};
                // get value for sort data based on fn( $elem ) passed in
                for (var key in getSortData) {
                    if (!isIncrementingElemCount && key === 'original-order') {
                        // keep original order original
                        sortData[key] = $.data(this, 'isotope-sort-data')[key];
                    } else {
                        sortData[key] = getSortData[key]($this, instance);
                    }
                }
                // apply sort data to element
                $.data(this, 'isotope-sort-data', sortData);
            });
        },

        // used on all the filtered atoms
        _sort: function () {

            var sortBy = this.options.sortBy,
          getSorter = this._getSorter,
          sortDir = this.options.sortAscending ? 1 : -1,
          sortFn = function (alpha, beta) {
              var a = getSorter(alpha, sortBy),
                b = getSorter(beta, sortBy);
              // fall back to original order if data matches
              if (a === b && sortBy !== 'original-order') {
                  a = getSorter(alpha, 'original-order');
                  b = getSorter(beta, 'original-order');
              }
              return ((a > b) ? 1 : (a < b) ? -1 : 0) * sortDir;
          };

            this.$filteredAtoms.sort(sortFn);
        },

        _getSorter: function (elem, sortBy) {
            return $.data(elem, 'isotope-sort-data')[sortBy];
        },

        // ====================== Layout Helpers ======================

        _translate: function (x, y) {
            return { translate: [x, y] };
        },

        _positionAbs: function (x, y) {
            return { left: x, top: y };
        },

        _pushPosition: function ($elem, x, y) {
            x = Math.round(x + this.offset.left);
            y = Math.round(y + this.offset.top);
            var position = this.getPositionStyles(x, y);
            this.styleQueue.push({ $el: $elem, style: position });
            if (this.options.itemPositionDataEnabled) {
                $elem.data('isotope-item-position', { x: x, y: y });
            }
        },


        // ====================== General Layout ======================

        // used on collection of atoms (should be filtered, and sorted before )
        // accepts atoms-to-be-laid-out to start with
        layout: function ($elems, callback) {

            var layoutMode = this.options.layoutMode;

            // layout logic
            this['_' + layoutMode + 'Layout']($elems);

            // set the size of the container
            if (this.options.resizesContainer) {
                var containerStyle = this['_' + layoutMode + 'GetContainerSize']();
                this.styleQueue.push({ $el: this.element, style: containerStyle });
            }

            this._processStyleQueue($elems, callback);

            this.isLaidOut = true;
        },

        _processStyleQueue: function ($elems, callback) {
            // are we animating the layout arrangement?
            // use plugin-ish syntax for css or animate
            var styleFn = !this.isLaidOut ? 'css' : (
            this.isUsingJQueryAnimation ? 'animate' : 'css'
          ),
          animOpts = this.options.animationOptions,
          onLayout = this.options.onLayout,
          objStyleFn, processor,
          triggerCallbackNow, callbackFn;

            // default styleQueue processor, may be overwritten down below
            processor = function (i, obj) {
                obj.$el[styleFn](obj.style, animOpts);
            };

            if (this._isInserting && this.isUsingJQueryAnimation) {
                // if using styleQueue to insert items
                processor = function (i, obj) {
                    // only animate if it not being inserted
                    objStyleFn = obj.$el.hasClass('no-transition') ? 'css' : styleFn;
                    obj.$el[objStyleFn](obj.style, animOpts);
                };

            } else if (callback || onLayout || animOpts.complete) {
                // has callback
                var isCallbackTriggered = false,
            // array of possible callbacks to trigger
            callbacks = [callback, onLayout, animOpts.complete],
            instance = this;
                triggerCallbackNow = true;
                // trigger callback only once
                callbackFn = function () {
                    if (isCallbackTriggered) {
                        return;
                    }
                    var hollaback;
                    for (var i = 0, len = callbacks.length; i < len; i++) {
                        hollaback = callbacks[i];
                        if (typeof hollaback === 'function') {
                            hollaback.call(instance.element, $elems, instance);
                        }
                    }
                    isCallbackTriggered = true;
                };

                if (this.isUsingJQueryAnimation && styleFn === 'animate') {
                    // add callback to animation options
                    animOpts.complete = callbackFn;
                    triggerCallbackNow = false;

                } else if (Modernizr.csstransitions) {
                    // detect if first item has transition
                    var i = 0,
              firstItem = this.styleQueue[0],
              testElem = firstItem && firstItem.$el,
              styleObj;
                    // get first non-empty jQ object
                    while (!testElem || !testElem.length) {
                        styleObj = this.styleQueue[i++];
                        // HACK: sometimes styleQueue[i] is undefined
                        if (!styleObj) {
                            return;
                        }
                        testElem = styleObj.$el;
                    }
                    // get transition duration of the first element in that object
                    // yeah, this is inexact
                    var duration = parseFloat(getComputedStyle(testElem[0])[transitionDurProp]);
                    if (duration > 0) {
                        processor = function (i, obj) {
                            obj.$el[styleFn](obj.style, animOpts)
                // trigger callback at transition end
                .one(transitionEndEvent, callbackFn);
                        };
                        triggerCallbackNow = false;
                    }
                }
            }

            // process styleQueue
            $.each(this.styleQueue, processor);

            if (triggerCallbackNow) {
                callbackFn();
            }

            // clear out queue for next time
            this.styleQueue = [];
        },


        resize: function () {
            if (this['_' + this.options.layoutMode + 'ResizeChanged']()) {
                this.reLayout();
            }
        },


        reLayout: function (callback) {

            this['_' + this.options.layoutMode + 'Reset']();
            this.layout(this.$filteredAtoms, callback);

        },

        // ====================== Convenience methods ======================

        // ====================== Adding items ======================

        // adds a jQuery object of items to a isotope container
        addItems: function ($content, callback) {
            var $newAtoms = this._getAtoms($content);
            // add new atoms to atoms pools
            this.$allAtoms = this.$allAtoms.add($newAtoms);

            if (callback) {
                callback($newAtoms);
            }
        },

        // convienence method for adding elements properly to any layout
        // positions items, hides them, then animates them back in <--- very sezzy
        insert: function ($content, callback) {
            // position items
            this.element.append($content);

            var instance = this;
            this.addItems($content, function ($newAtoms) {
                var $newFilteredAtoms = instance._filter($newAtoms);
                instance._addHideAppended($newFilteredAtoms);
                instance._sort();
                instance.reLayout();
                instance._revealAppended($newFilteredAtoms, callback);
            });

        },

        // convienence method for working with Infinite Scroll
        appended: function ($content, callback) {
            var instance = this;
            this.addItems($content, function ($newAtoms) {
                instance._addHideAppended($newAtoms);
                instance.layout($newAtoms);
                instance._revealAppended($newAtoms, callback);
            });
        },

        // adds new atoms, then hides them before positioning
        _addHideAppended: function ($newAtoms) {
            this.$filteredAtoms = this.$filteredAtoms.add($newAtoms);
            $newAtoms.addClass('no-transition');

            this._isInserting = true;

            // apply hidden styles
            this.styleQueue.push({ $el: $newAtoms, style: this.options.hiddenStyle });
        },

        // sets visible style on new atoms
        _revealAppended: function ($newAtoms, callback) {
            var instance = this;
            // apply visible style after a sec
            setTimeout(function () {
                // enable animation
                $newAtoms.removeClass('no-transition');
                // reveal newly inserted filtered elements
                instance.styleQueue.push({ $el: $newAtoms, style: instance.options.visibleStyle });
                instance._isInserting = false;
                instance._processStyleQueue($newAtoms, callback);
            }, 10);
        },

        // gathers all atoms
        reloadItems: function () {
            this.$allAtoms = this._getAtoms(this.element.children());
        },

        // removes elements from Isotope widget
        remove: function ($content, callback) {
            // remove elements from Isotope instance in callback
            var instance = this;
            // remove() as a callback, for after transition / animation
            var removeContent = function () {
                instance.$allAtoms = instance.$allAtoms.not($content);
                $content.remove();
                if (callback) {
                    callback.call(instance.element);
                }
            };

            if ($content.filter(':not(.' + this.options.hiddenClass + ')').length) {
                // if any non-hidden content needs to be removed
                this.styleQueue.push({ $el: $content, style: this.options.hiddenStyle });
                this.$filteredAtoms = this.$filteredAtoms.not($content);
                this._sort();
                this.reLayout(removeContent);
            } else {
                // remove it now
                removeContent();
            }

        },

        shuffle: function (callback) {
            this.updateSortData(this.$allAtoms);
            this.options.sortBy = 'random';
            this._sort();
            this.reLayout(callback);
        },

        // destroys widget, returns elements and container back (close) to original style
        destroy: function () {

            var usingTransforms = this.usingTransforms;
            var options = this.options;

            this.$allAtoms
        .removeClass(options.hiddenClass + ' ' + options.itemClass)
        .each(function () {
            var style = this.style;
            style.position = '';
            style.top = '';
            style.left = '';
            style.opacity = '';
            if (usingTransforms) {
                style[transformProp] = '';
            }
        });

            // re-apply saved container styles
            var elemStyle = this.element[0].style;
            for (var prop in this.originalStyle) {
                elemStyle[prop] = this.originalStyle[prop];
            }

            this.element
        .unbind('.isotope')
        .undelegate('.' + options.hiddenClass, 'click')
        .removeClass(options.containerClass)
        .removeData('isotope');

            $window.unbind('.isotope');

        },


        // ====================== LAYOUTS ======================

        // calculates number of rows or columns
        // requires columnWidth or rowHeight to be set on namespaced object
        // i.e. this.masonry.columnWidth = 200
        _getSegments: function (isRows) {
            var namespace = this.options.layoutMode,
          measure = isRows ? 'rowHeight' : 'columnWidth',
          size = isRows ? 'height' : 'width',
          segmentsName = isRows ? 'rows' : 'cols',
          containerSize = this.element[size](),
          segments,
                    // i.e. options.masonry && options.masonry.columnWidth
          segmentSize = this.options[namespace] && this.options[namespace][measure] ||
                    // or use the size of the first item, i.e. outerWidth
                    this.$filteredAtoms['outer' + capitalize(size)](true) ||
                    // if there's no items, use size of container
                    containerSize;

            segments = Math.floor(containerSize / segmentSize);
            segments = Math.max(segments, 1);

            // i.e. this.masonry.cols = ....
            this[namespace][segmentsName] = segments;
            // i.e. this.masonry.columnWidth = ...
            this[namespace][measure] = segmentSize;

        },

        _checkIfSegmentsChanged: function (isRows) {
            var namespace = this.options.layoutMode,
          segmentsName = isRows ? 'rows' : 'cols',
          prevSegments = this[namespace][segmentsName];
            // update cols/rows
            this._getSegments(isRows);
            // return if updated cols/rows is not equal to previous
            return (this[namespace][segmentsName] !== prevSegments);
        },

        // ====================== Masonry ======================

        _masonryReset: function () {
            // layout-specific props
            this.masonry = {};
            // FIXME shouldn't have to call this again
            this._getSegments();
            var i = this.masonry.cols;
            this.masonry.colYs = [];
            while (i--) {
                this.masonry.colYs.push(0);
            }
        },

        _masonryLayout: function ($elems) {
            var instance = this,
          props = instance.masonry;
            $elems.each(function () {
                var $this = $(this),
            //how many columns does this brick span
            colSpan = Math.ceil($this.outerWidth(true) / props.columnWidth);
                colSpan = Math.min(colSpan, props.cols);

                if (colSpan === 1) {
                    // if brick spans only one column, just like singleMode
                    instance._masonryPlaceBrick($this, props.colYs);
                } else {
                    // brick spans more than one column
                    // how many different places could this brick fit horizontally
                    var groupCount = props.cols + 1 - colSpan,
              groupY = [],
              groupColY,
              i;

                    // for each group potential horizontal position
                    for (i = 0; i < groupCount; i++) {
                        // make an array of colY values for that one group
                        groupColY = props.colYs.slice(i, i + colSpan);
                        // and get the max value of the array
                        groupY[i] = Math.max.apply(Math, groupColY);
                    }

                    instance._masonryPlaceBrick($this, groupY);
                }
            });
        },

        // worker method that places brick in the columnSet
        //   with the the minY
        _masonryPlaceBrick: function ($brick, setY) {
            // get the minimum Y value from the columns
            var minimumY = Math.min.apply(Math, setY),
          shortCol = 0;

            // Find index of short column, the first from the left
            for (var i = 0, len = setY.length; i < len; i++) {
                if (setY[i] === minimumY) {
                    shortCol = i;
                    break;
                }
            }

            // position the brick
            var x = this.masonry.columnWidth * shortCol,
          y = minimumY;
            this._pushPosition($brick, x, y);

            // apply setHeight to necessary columns
            var setHeight = minimumY + $brick.outerHeight(true),
          setSpan = this.masonry.cols + 1 - len;
            for (i = 0; i < setSpan; i++) {
                this.masonry.colYs[shortCol + i] = setHeight;
            }

        },

        _masonryGetContainerSize: function () {
            var containerHeight = Math.max.apply(Math, this.masonry.colYs);
            return { height: containerHeight };
        },

        _masonryResizeChanged: function () {
            return this._checkIfSegmentsChanged();
        },

        // ====================== fitRows ======================

        _fitRowsReset: function () {
            this.fitRows = {
                x: 0,
                y: 0,
                height: 0
            };
        },

        _fitRowsLayout: function ($elems) {
            var instance = this,
          containerWidth = this.element.width(),
          props = this.fitRows;

            $elems.each(function () {
                var $this = $(this),
            atomW = $this.outerWidth(true),
            atomH = $this.outerHeight(true);

                if (props.x !== 0 && atomW + props.x > containerWidth) {
                    // if this element cannot fit in the current row
                    props.x = 0;
                    props.y = props.height;
                }

                // position the atom
                instance._pushPosition($this, props.x, props.y);

                props.height = Math.max(props.y + atomH, props.height);
                props.x += atomW;

            });
        },

        _fitRowsGetContainerSize: function () {
            return { height: this.fitRows.height };
        },

        _fitRowsResizeChanged: function () {
            return true;
        },


        // ====================== cellsByRow ======================

        _cellsByRowReset: function () {
            this.cellsByRow = {
                index: 0
            };
            // get this.cellsByRow.columnWidth
            this._getSegments();
            // get this.cellsByRow.rowHeight
            this._getSegments(true);
        },

        _cellsByRowLayout: function ($elems) {
            var instance = this,
          props = this.cellsByRow;
            $elems.each(function () {
                var $this = $(this),
            col = props.index % props.cols,
            row = Math.floor(props.index / props.cols),
            x = (col + 0.5) * props.columnWidth - $this.outerWidth(true) / 2,
            y = (row + 0.5) * props.rowHeight - $this.outerHeight(true) / 2;
                instance._pushPosition($this, x, y);
                props.index++;
            });
        },

        _cellsByRowGetContainerSize: function () {
            return { height: Math.ceil(this.$filteredAtoms.length / this.cellsByRow.cols) * this.cellsByRow.rowHeight + this.offset.top };
        },

        _cellsByRowResizeChanged: function () {
            return this._checkIfSegmentsChanged();
        },


        // ====================== straightDown ======================

        _straightDownReset: function () {
            this.straightDown = {
                y: 0
            };
        },

        _straightDownLayout: function ($elems) {
            var instance = this;
            $elems.each(function (i) {
                var $this = $(this);
                instance._pushPosition($this, 0, instance.straightDown.y);
                instance.straightDown.y += $this.outerHeight(true);
            });
        },

        _straightDownGetContainerSize: function () {
            return { height: this.straightDown.y };
        },

        _straightDownResizeChanged: function () {
            return true;
        },


        // ====================== masonryHorizontal ======================

        _masonryHorizontalReset: function () {
            // layout-specific props
            this.masonryHorizontal = {};
            // FIXME shouldn't have to call this again
            this._getSegments(true);
            var i = this.masonryHorizontal.rows;
            this.masonryHorizontal.rowXs = [];
            while (i--) {
                this.masonryHorizontal.rowXs.push(0);
            }
        },

        _masonryHorizontalLayout: function ($elems) {
            var instance = this,
          props = instance.masonryHorizontal;
            $elems.each(function () {
                var $this = $(this),
            //how many rows does this brick span
            rowSpan = Math.ceil($this.outerHeight(true) / props.rowHeight);
                rowSpan = Math.min(rowSpan, props.rows);

                if (rowSpan === 1) {
                    // if brick spans only one column, just like singleMode
                    instance._masonryHorizontalPlaceBrick($this, props.rowXs);
                } else {
                    // brick spans more than one row
                    // how many different places could this brick fit horizontally
                    var groupCount = props.rows + 1 - rowSpan,
              groupX = [],
              groupRowX, i;

                    // for each group potential horizontal position
                    for (i = 0; i < groupCount; i++) {
                        // make an array of colY values for that one group
                        groupRowX = props.rowXs.slice(i, i + rowSpan);
                        // and get the max value of the array
                        groupX[i] = Math.max.apply(Math, groupRowX);
                    }

                    instance._masonryHorizontalPlaceBrick($this, groupX);
                }
            });
        },

        _masonryHorizontalPlaceBrick: function ($brick, setX) {
            // get the minimum Y value from the columns
            var minimumX = Math.min.apply(Math, setX),
          smallRow = 0;
            // Find index of smallest row, the first from the top
            for (var i = 0, len = setX.length; i < len; i++) {
                if (setX[i] === minimumX) {
                    smallRow = i;
                    break;
                }
            }

            // position the brick
            var x = minimumX,
          y = this.masonryHorizontal.rowHeight * smallRow;
            this._pushPosition($brick, x, y);

            // apply setHeight to necessary columns
            var setWidth = minimumX + $brick.outerWidth(true),
          setSpan = this.masonryHorizontal.rows + 1 - len;
            for (i = 0; i < setSpan; i++) {
                this.masonryHorizontal.rowXs[smallRow + i] = setWidth;
            }
        },

        _masonryHorizontalGetContainerSize: function () {
            var containerWidth = Math.max.apply(Math, this.masonryHorizontal.rowXs);
            return { width: containerWidth };
        },

        _masonryHorizontalResizeChanged: function () {
            return this._checkIfSegmentsChanged(true);
        },


        // ====================== fitColumns ======================

        _fitColumnsReset: function () {
            this.fitColumns = {
                x: 0,
                y: 0,
                width: 0
            };
        },

        _fitColumnsLayout: function ($elems) {
            var instance = this,
          containerHeight = this.element.height(),
          props = this.fitColumns;
            $elems.each(function () {
                var $this = $(this),
            atomW = $this.outerWidth(true),
            atomH = $this.outerHeight(true);

                if (props.y !== 0 && atomH + props.y > containerHeight) {
                    // if this element cannot fit in the current column
                    props.x = props.width;
                    props.y = 0;
                }

                // position the atom
                instance._pushPosition($this, props.x, props.y);

                props.width = Math.max(props.x + atomW, props.width);
                props.y += atomH;

            });
        },

        _fitColumnsGetContainerSize: function () {
            return { width: this.fitColumns.width };
        },

        _fitColumnsResizeChanged: function () {
            return true;
        },



        // ====================== cellsByColumn ======================

        _cellsByColumnReset: function () {
            this.cellsByColumn = {
                index: 0
            };
            // get this.cellsByColumn.columnWidth
            this._getSegments();
            // get this.cellsByColumn.rowHeight
            this._getSegments(true);
        },

        _cellsByColumnLayout: function ($elems) {
            var instance = this,
          props = this.cellsByColumn;
            $elems.each(function () {
                var $this = $(this),
            col = Math.floor(props.index / props.rows),
            row = props.index % props.rows,
            x = (col + 0.5) * props.columnWidth - $this.outerWidth(true) / 2,
            y = (row + 0.5) * props.rowHeight - $this.outerHeight(true) / 2;
                instance._pushPosition($this, x, y);
                props.index++;
            });
        },

        _cellsByColumnGetContainerSize: function () {
            return { width: Math.ceil(this.$filteredAtoms.length / this.cellsByColumn.rows) * this.cellsByColumn.columnWidth };
        },

        _cellsByColumnResizeChanged: function () {
            return this._checkIfSegmentsChanged(true);
        },

        // ====================== straightAcross ======================

        _straightAcrossReset: function () {
            this.straightAcross = {
                x: 0
            };
        },

        _straightAcrossLayout: function ($elems) {
            var instance = this;
            $elems.each(function (i) {
                var $this = $(this);
                instance._pushPosition($this, instance.straightAcross.x, 0);
                instance.straightAcross.x += $this.outerWidth(true);
            });
        },

        _straightAcrossGetContainerSize: function () {
            return { width: this.straightAcross.x };
        },

        _straightAcrossResizeChanged: function () {
            return true;
        }

    };


    // ======================= imagesLoaded Plugin ===============================
    /*!
   * jQuery imagesLoaded plugin v1.1.0
   * http://github.com/desandro/imagesloaded
   *
   * MIT License. by Paul Irish et al.
   */


    // $('#my-container').imagesLoaded(myFunction)
    // or
    // $('img').imagesLoaded(myFunction)

    // execute a callback when all images have loaded.
    // needed because .load() doesn't work on cached images

    // callback function gets image collection as argument
    //  `this` is the container

    $.fn.imagesLoaded = function (callback) {
        var $this = this,
        $images = $this.find('img').add($this.filter('img')),
        len = $images.length,
        blank = '',
        loaded = [];

        function triggerCallback() {
            callback.call($this, $images);
        }

        function imgLoaded(event) {
            var img = event.target;
            if (img.src !== blank && $.inArray(img, loaded) === -1) {
                loaded.push(img);
                if (--len <= 0) {
                    setTimeout(triggerCallback);
                    $images.unbind('.imagesLoaded', imgLoaded);
                }
            }
        }

        // if no images, trigger immediately
        if (!len) {
            triggerCallback();
        }

        $images.bind('load.imagesLoaded error.imagesLoaded', imgLoaded).each(function () {
            // cached images don't fire load sometimes, so we reset src.
            var src = this.src;
            // webkit hack from http://groups.google.com/group/jquery-dev/browse_thread/thread/eee6ab7b2da50e1f
            // data uri bypasses webkit log warning (thx doug jones)
            this.src = blank;
            this.src = src;
        });

        return $this;
    };


    // helper function for logging errors
    // $.error breaks jQuery chaining
    var logError = function (message) {
        if (window.console) {
            window.console.error(message);
        }
    };

    // =======================  Plugin bridge  ===============================
    // leverages data method to either create or return $.Isotope constructor
    // A bit from jQuery UI
    //   https://github.com/jquery/jquery-ui/blob/master/ui/jquery.ui.widget.js
    // A bit from jcarousel
    //   https://github.com/jsor/jcarousel/blob/master/lib/jquery.jcarousel.js

    $.fn.isotope = function (options, callback) {
        if (typeof options === 'string') {
            // call method
            var args = Array.prototype.slice.call(arguments, 1);

            this.each(function () {
                var instance = $.data(this, 'isotope');
                if (!instance) {
                    logError("cannot call methods on isotope prior to initialization; " +
              "attempted to call method '" + options + "'");
                    return;
                }
                if (!$.isFunction(instance[options]) || options.charAt(0) === "_") {
                    logError("no such method '" + options + "' for isotope instance");
                    return;
                }
                // apply method
                instance[options].apply(instance, args);
            });
        } else {
            this.each(function () {
                var instance = $.data(this, 'isotope');
                if (instance) {
                    // apply options & init
                    instance.option(options);
                    instance._init(callback);
                } else {
                    // initialize new instance
                    $.data(this, 'isotope', new $.Isotope(options, this, callback));
                }
            });
        }
        // return jQuery object
        // so plugin methods do not have to
        return this;
    };

})(window, jQuery);